Finding the Fourth Proportional to 111.21, 153.47 and 62.09
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Solution
The fourth proportional to 111.21, 153.47 and 62.09 is: 85.68
Step by Step Solution
- Step 1: Write the proportion equation
111.21 : 153.47 = 62.09 : x - Step 2: Convert to fraction form
111.21/153.47 = 62.09/x - Step 3: Cross multiply
111.21x = 153.47 × 62.09 - Step 4: Simplify right side
111.21x = 9,528.72 - Step 5: Solve for x
x = 9,528.72/111.21 - Step 6: Final answer
x = 85.68
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.